KING OF CHICAGO: LeBron James ran circles around the Bulls all night, including on this pass from under the basket that tantalized Chris Andersen (11), Taj Gibson (22) and Jimmy Butler (21), to pace the Heat’s 88-65 Game 4 victory in Chicago. Photo: Reuters

MEMPHIS — The Grizzlies are proving they know how to grab an advantage and hold on to it this postseason.

Tony Allen scored on a driving layup to open overtime and the Grizzlies held off the Thunder 103-97 last night to push the defending Western Conference champs to the edge of elimination.

The Grizzlies shook off a first half in which they couldn’t hit shots and the Thunder seemingly couldn’t miss in building their largest lead in this series at 17 points. But the Grizzlies have yet to lose on their home court this postseason, and they won their third straight and seventh in eight games to grab a 3-1 lead in the series.

“We have an opportunity in front of us that we can take advantage of,” Grizzlies guard Mike Conley said. “I know our guys are focused. We’re treating it one game at a time. We know they’re going to fight like they have their backs against the wall just like they did tonight. They’re going to play with a sense of urgency, and we have to be ready.”

Game 5 is tomorrow night in Oklahoma City, and the Thunder have played in the Western finals each of the past two playoffs. But they don’t have Russell Westbrook (knee injury) in this series.

“It’s not over yet, and we understand that,” Thunder coach Scott Brooks said. “It’s the first to four. They’re in a good position, but our challenge is not impossible. It’s something that we can do. We just have to focus one possession, one game at a time. Hopefully, we can do that and come back here Friday night. There’s a barbecue festival, right?”

The Grizzlies outscored the Thunder 9-3 in overtime.

Kevin Durant scored 27 points but missed all five of his shots in the extra period, including a layup in the final seconds. Durant went 2 of 13 in the fourth quarter and overtime and had only five points. He did score on a driving layup that forced overtime. But the All-Star played 48 minutes and was just short on his shots as the game wore on.

Mike Conley led Memphis with 24 points. Marc Gasol and Zach Randolph each had double-doubles. Randolph had 23 and 12, while Gasol had 23 and 11 along with six blocks.